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交作业

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北卡上校

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import re
from datetime import datetime, timezone, timedelta


def to_timestamp(dt_str, tz_str):
    dt = datetime.strptime(dt_str, '%Y-%m-%d %H:%M:%S')
    tz_group = re.match(r'\w+(\W+)(\d+):\d+', tz_str).groups()
    if tz_group[0] == '-':
        tz_num = 0 - int(tz_group[1])
    else:
        tz_num = int(tz_group[1])
    tz_utc = timezone(timedelta(hours=tz_num))
    return dt.replace(tzinfo=tz_utc).timestamp()
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